先给大家展示下效果图：
///作者：柯锦 ///完成时间：2016.08.16 ///多文件异步上传带进度条 (function ($) { function bytesToSize(bytes) { if (bytes === 0) return '0 B'; var k = 1024, // or 1000 sizes = ['B', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'], i = Math.floor(Math.log(bytes) / Math.log(k)); return (bytes / Math.pow(k, i)).toPrecision(3) + ' ' + sizes[i]; } function changeCursor(obj) { obj.style.cursor = 'pointer' } function deleteSelfAndFile(obj) { var that = $(obj); var parentLi = that.parent("li"); that.remove(); parentLi.remove(); } function CreateXMLHttpRequest(target) { var xhr = new XMLHttpRequest(); //var ops = $.data(target, "KJajaxUpload").Options; //var v, h, evs = { loadstart: 0, loadend: 0, progress: 0, load: 0, error: 0, abort: 0 }; //for (v in evs) { // if (h = ops['on' + v]) { // xhr.upload.addEventListener(v, h, false); // } //} return xhr; } function InitFileDiv(target, options) { var _that = $(target); var width = _that.width(); var hasUploadedDiv = $("<div/>"); hasUploadedDiv.css({ width: "100%" }); _that.append(hasUploadedDiv);// 上 var divClear = $("<div></div>"); var divUploadBody = $("<div/>"); var divLeft = $("<div/>"); var divRight = $("<div/>"); var uploadButton = $("<input type='button' value='Select File' />"); if (options.Text) { uploadButton.val(options.Text); } uploadButton.click(function () { SelectFiles(target); }) uploadButton.css({ width: 80 }) if (options.Available) { uploadButton.prop("disabled", false); } else { uploadButton.prop("disabled", true); } divUploadBody.css({ "overflow": "hidden" }) divLeft.css({ float: "left", width: "100%" }) divRight.css({ float: "left", "margin-left": " -20px" }) _that.append(divClear); divLeft.append(uploadButton);// 左 button divLeft.append("<font>可多选</font>") divUploadBody.append(divLeft);// 左 divUploadBody.append(divRight);// 右 文件列表 _that.append(divUploadBody); return _that; } /// 创建蒙版 function CreateMark(target) { var mark; var width = $(document.body).width() / 2 - 200; mark = $("<div>"); mark.css({ width: "100%", height: "100%", position: "fixed", left: 0, top: 0, opacity: 0.5, "z-index": 8, "background-color": "#EFEFF2", "display": "none" }); var contentText = $("<div>"); contentText.html("文件上传中，请稍后..."); contentText.css({ "text-align": "center", width: "400px", "padding-bottom": "50px", "z-index": 9, position: "fixed", left: width + "px", "top": "50%", "background-color": "white", "display": "none" }) contentText.appendTo($("body")); mark.appendTo($("body")); return mark; } ///创建进度条 function CreateUploadBar(target) { var contentText = $(".KJajaxUpload_upload_wrapper"); var fileDiv = $(target);// $.data(target, "KJajaxUpload").FileDiv; var FileList = fileDiv.find(".fileuploadlist.newfilelist"); $.each(FileList, function (i) { var fileName = $(this).attr("filename"); var divid = $(this).attr("id"); var proressDiv = $("<div />"); var fileNameLable = $("<span >" + fileName + "</span>"); var barDiv = $("<div/>"); barDiv.css({ width: "350px", "margin-left": "20px", height: "22px", border: "1px solid black ", "line-height": "22px" }) var barText1 = $("<div/>"); barText1.css({ "text-align": "center", "position": "absolute", width: "350px" }); barText1.html("0%"); var barText2 = $("<div/>"); barText2.css({ "text-align": "center", width: "350px", "background-color": "#ffe48d" }); barText2.html("0%"); var barValue = $("<div>"); barValue.css({ position: "relative", overflow: "hidden", width: "0px" }) barValue.append(barText2); barDiv.append(barText1); barDiv.append(barValue); proressDiv.append(fileNameLable); contentText.append(proressDiv); contentText.append(barDiv); }); } function ChangeProcess(filename, evt) { var loaded = evt.loaded; //已经上传大小情况 var tot = evt.total; //附件总大小 var per = Math.floor(100 * loaded / tot); //已经上传的百分比 var that = $("[name='KJajaxUpload_bar_" + filename + "']"); that.find('div.KJajaxUpload_progressvalue').css("width", per + "%"); that.find('div.KJajaxUpload_progresstext').html(per + "%"); } ///选择文件 function SelectFiles(target) { var options = $.data(target, "KJajaxUpload").Options; var deleteButtonUrl = options.deleteButtonUrl; var ele = $("<input type='file'/>"); ele.prop("multiple", options.multiple !== false); ele.hide(); ele.change(function (e) { var exist = false; var files = e.target.files; var filenames = GetalreadyExistFileNames(target); for (var item in files) { var file = files[item]; if ($.inArray(file.name, filenames) > -1) { exist = true; break; } } if (!exist) { var ul = $("<ul/>"); for (var i = 0, n = files.length; i < n; i++) { var deletebutton = $("<img src='" + deleteButtonUrl + "' />"); deletebutton.click(function () { deleteSelfAndFile(this); }) var guid = new GUID().New(); var li = $('<li filename="' + files[i].name + '" >' + files[i].name + ' (' + bytesToSize(files[i].size) + ' )</li>'); li.append(deletebutton); ul.append(li); } $(target).find(".KJajaxUpload_Right").append(ul); options.onChange.call(this, e); } else { alert("文件名重复"); ele.remove(); return } }); $(target).append(ele); ele.click(); } /// 获取已经存在的文件名列表 function GetalreadyExistFileNames(target) { var that = $(target); var fileExists = that.find(".fileuploadlist"); var fileNames = []; /// 还存在的文件列表 fileExists.each(function () { var filename = $(this).attr("filename"); if ($.inArray(filename, fileNames) == -1) { fileNames.push(filename); } }) return fileNames; } /// 上传文件 function UploadFiles(target) { var that = $(target); var fileInputs = that.find(":file"); var options = $.data(target, "KJajaxUpload").Options; var deleteButtonUrl = options.deleteButtonUrl; var onUploaded = options.onUploaded; if (fileInputs.length > 0) { var total = 0; var uploaded = 0; var reponses = []; var mark = $.data(target, "KJajaxUpload").Mark; var markcontent = $(".KJajaxUpload_upload_wrapper"); mark.show(); markcontent.show(); CreateUploadBar(target); var fileExists = that.find(".fileuploadlist"); var fileNames = []; /// 还存在的文件列表 fileExists.each(function () { var filename = $(this).attr("filename"); if ($.inArray(filename, fileNames) == -1) { fileNames.push(filename); } }) for (var i = 0; i < fileInputs.length; i++) { var fileinput = fileInputs[i]; var files = fileinput.files; if (files.length > 0) { for (var j = 0, n = files.length; j < n; j++) { if ($.inArray(files[j].name, fileNames) > -1) { total++; var filename = files[j].name; var paramData = options.formData; var data = new FormData(); data.append("uploadedfile[" + j + "]", files[j]); if (paramData != null) { for (var k in paramData) { data.append(k, paramData[k]); } } var xhr = CreateXMLHttpRequest(target); xhr.upload.addEventListener("progress", function (data) { return function (e) { ChangeProcess(data, e); } }(filename), false); xhr.upload.addEventListener("loadend", function () { }, false); xhr.upload.addEventListener("load", function () { uploaded++; }, false); xhr.onreadystatechange = function () { if (this.readyState == 4) {// 4 = "loaded" if (this.status == 200) {// 200 = OK reponses.push(this.responseText); if (uploaded == $.data(target, "KJajaxUpload").TotalFiles) { var HasUploaded = that.find(".KJajaxUpload_HasUploaded"); var ul = $("<ul/>"); for (var t = 0; t < reponses.length; t++) { var files = JSON.parse(reponses[t]); for (var i = 0, n = files.length; i < n; i++) { var deletebutton = $("<img src='" + deleteButtonUrl + "' />"); deletebutton.click(function () { deleteSelfAndFile(this); }) var guid = new GUID().New(); var li = $('<li filename="' + files[i].Name + '" filepath="' + files[i].FilePath + '" ><a target="_blank" href="' + files[i].FileUrl + '">' + files[i].Name + '</a> </li>'); li.append(deletebutton); ul.append(li); } } that.find(".KJajaxUpload_Right").empty(); HasUploaded.append(ul); fileInputs.remove(); Uploaded(target); var data = GetAlreadyUploadedFiles(target); onUploaded.call(null, data); } } else { alert("Problem retrieving XML data"); } } }; xhr.open("POST", options.url, true); xhr.send(data); } } var state = $.data(target, "KJajaxUpload"); state.TotalFiles = total; $.data(this, "KJajaxUpload", state); } } } else { var data = GetAlreadyUploadedFiles(target); onUploaded.call(null, data); } return that; } /// 上传完毕 function Uploaded(target) { alert("文件上传完毕"); var mark = $.data(target, "KJajaxUpload").Mark; var markcontent = $(".KJajaxUpload_upload_wrapper"); mark.hide(); markcontent.hide(); var that = $(target); var fileInputs = that.find(":file"); fileInputs.remove(); } ///初始化已有的数据 function AlreadFiles(target, options) { var that = $(target); var deleteButtonUrl = options.deleteButtonUrl; var files = options.AlreadFiles; var HasUploaded = that.find(".KJajaxUpload_HasUploaded"); if (files.length > 0) { var ul = $("<ul/>"); for (var i = 0, n = files.length; i < n; i++) { var deletebutton = $("<img src='" + deleteButtonUrl + "' />"); deletebutton.click(function () { deleteSelfAndFile(this); }) var pos = files[i].lastIndexOf("\\"); var filepos = files[i].lastIndexOf("uploadFile"); var reg = /[\\\/]/g; var filePath = files[i]; var fileUrl = files[i].substr(filepos).replace(reg, 'https://www.jb51.net/'); var fileName = files[i].substr(pos + 1); fileName = fileName.substr(fileName.lastIndexOf("_S_") + 3); var guid = new GUID().New(); var li = $('<li filename="' + fileName + '" filepath="' + filePath + '" ><a target="_blank" href="' + fileUrl + '">' + fileName + '</a> </li>'); li.append(deletebutton); ul.append(li); } HasUploaded.append(ul); } } function GetAlreadyUploadedFiles(target) { var that = $(target); var HasUploaded = that.find(".KJajaxUpload_HasUploaded li"); var datas = []; HasUploaded.each(function () { var data = {}; data.name = $(this).attr("filename"); data.filepath = $(this).attr("filepath"); data.fileurl = $(this).find("a").attr("href"); datas.push(data); }) return datas; } $.fn.KJajaxUpload = function (options, param) { var that = this; if (typeof options == "string") { var method = $.fn.KJajaxUpload.Methods[options]; if (method) { return method(this, param); } } options = options || {}; return this.each(function () { var that = this; var state = $.data(this, "KJajaxUpload"); if (state) { $.extend(state.Options, options); } else { var _options = $.extend({}, $.fn.KJajaxUpload.Default, options); InitFileDiv(this, _options); AlreadFiles(this, _options); state = $.data(this, "KJajaxUpload", { Options: _options, Mark: CreateMark(this), TotalFiles: 0 }); } }) } $.fn.KJajaxUpload.Default = { url: '/Ashx/UploadFilesHandler.ashx?r=' + Math.random(), formData: {},//要传递的参数 Text: "选择文件", ContinueAddText: "继续添加", multiple: true, AlreadFiles: [],// 初始化已经存在的文件 Available: true,// 可用的 deleteButtonUrl: '/Style/images/delete.jpg', onInit: function () { }, onChange: function () { }, onUploaded: function () { }// 文件上传完毕后的回调函数 }; $.fn.KJajaxUpload.Methods = { options: function (jq) { return $.data(jq[0], "KJajaxUpload").Options; }, upload: function (jq) { return UploadFiles(jq[0]); } }; })(jQuery)
后端代码